Mar 5, 2020

Sweet peppers benefit from macrolophus-system

While macrolophus eats the eggs and larvae of greenhouse and tobacco whiteflies, it also loves aphids, spider mites and moth eggs.

The bright green macrolophus-system predatory bug is greedy and can be of great value to sweet pepper growers. However, timing and supplementation are crucial to its success, said Biobest advisor, John van Eijk.

Most sweet pepper growers begin with a chemical spray program after which they introduce predatory mites. With the imminent loss of more chemical actives, it is set to become increasingly challenging to control aphids, tobacco whitefly (Bemisia tabaci) and caterpillars.

“The macrolophus predatory bug is polyphagous, which means it eats almost everything, making it ideal for keeping a number of pests under control,” van Eijk said. “In tomato crops, for example, growers are already achieving great success with this bug.”

Between week 7 and 15

The right timing is important, explains van Eijk. “This predatory bug is extremely sensitive to chemical crop protection products, so it is important to take spray residues into account. Growers should not introduce macrolophus-system too soon after the start of the growing season, or too late – as they need time to build up a population: between week 7 and week 15 is ideal.”

Supplementation is a must

The use of a supplementary food source is a must for the healthy build-up of the macrolophus-system. “We advise adding Nutrimac with the introduction of the bugs,” says van Eijk. “Nutrimac™ consists of sterilised, protein-rich Ephestia eggs. Another option is Nutrimac-Plus which in addition contains Artemia -– brine shrimp cysts. Later in the growing season, most growers switch to 100% Artemia to ensure conditions are ideal for Macrolophus to succeed. The supplement may be applied in feeding rows by scattering or blowing.”

Benefits throughout entire season

Once the macrolophus population is well established, sweet pepper growers can reap the benefits throughout the entire season. John van Eijk says: “In the summer, we sometimes see several predatory bugs on a single flower. Whitefly, aphids, moth eggs (from caterpillars), spider mites, thrips – macrolophus gobbles them all up making it an excellent addition to your biological pest control programme.”

For more information, contact Lise Verachtert ([email protected]).